I guess you are using parasitic power mode for your devices.
The voltage drop on DQ is too important to power the ds2450 while still
enough to power ds1820.
Looking at datasheets reveal that the ds2450 require 4.5V as minimum
voltage while ds1820 works with voltage as low as 3.0V
My recommendation is to supply 5V on a third wire and ensure that slave
have their vcc connected on this wire.
Alternatively look if owfs provide control on active pullup and strong
pullup settings that may help to feed more slaves parasistically.
Pascal
2012/1/28 Lui Elle <[email protected]>
> hi,
> with USB9097 then plug 8 DS1820 and 2 DS2450 i see only 8 x DS1820 ,
> if plug only 2 x DS2450 , i see tow DS2450.
> if plug only 8 x DS1820 , i see 8 X DS1820
> why the DS2450 lost with DS1820 plugged ?
> thank you
>
>
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www.brain4home.eu
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